This a class of objects that look differently depending on the direction from which you look at it. Its shape is easily recognizable when looked at from the sid

This a class of objects that look differently depending on the direction from which you look at it. Its shape is easily recognizable when looked at from the side, but when looking directly at the bean is just a point source of radiation. Thus, while it is more luminous when looking at the bean, it may s easier than identify when looked at from the side. Imagine looking at flashlight at nighttime. The flashlight is bright when looking at it directly but then it is difficult to tell what kind of light source it is exactly. Tilt it a little and it becomes less bright but more recognizable.